Human rights and mental health laws..
European Court of Human Rights (Application n 34806/04 2012 X vs. Finland) is interesting because there article 8 (right to private life) is intepreted broadly to mean one has to have some “effective” way to appeal against forced treatments and other source implies that “right to private life” may mean that psychiatric advance directives may be legally binding(?).
Another interesting decision was that Germany supreme (constitutional?) court has made a decision that some forced treatments are unconstitutional.
Update: there is now a new bill in Germany for compulsory treatments: http://www.dw.de/bundestag-passes-bill-on-involuntary-treatment/a-16536563
Yet another questionable practice is to be able to treat people DURING legal processes (not innocent until proven guilty) that might be against some principles.
So yes, lawyers may help although more often you just waste time and money using them.